Jurors were told he had become increasingly suspicious she had been having affairs during their four month relationship while she was studying in England.

The court heard Turner had threatened to kill the blonde teenager, an aspiring model, with a lump hammer and boasted to her "I will go to prison for it and still be a millionaire when I come out."

Turner allegedly even demonstrated how to strangle someone on a friend and applied so much pressure his friend could not breathe.

CONFESSION 'DESTROYED' BY FATHER

Winchester Crown Court heard that after the murder Turner wrote a letter of confession but it was ruined with bleach by his father, Leigh, 54 to "destroy vital evidence."

Jurors heard that a police bug of the 350,000 pounds Turner home in the affluent Queens Park area of Bournemouth recorded the family talking about "fabricating evidence and being worried about lying to police."

The court heard that after the death, Turner's mother, Anita, 51, removed from the house a coat her son had worn on the night of Emily's death.

Police scans of computers seized from the home found Google searches for 'death by strangulation' and 'how to get out of being charged for murder.'

INCREASINGLY VIOLENT RELATIONSHIP

Prosecutor Timothy Mousley told the court Turner had become increasingly violent towards Emily, who is from Auckland, during their four month relationship.

He said "In the early hours of of the morning of May 7 last year Elliot Turner strangled and killed Emily Longley.

"They had been boyfriend and girlfriend for a short period of time in which Elliot showed himself to be threatening, aggressive, violent, controlling and possessive.

"He became suspicious of Emily and distrusting of her.

"These aspects of his character became more and more obvious and culminated in his killing Emily in his bedroom in the middle of the night.

"The state of their relationship can be seen from what friends of theirs saw when they went out socialising, from their text messages between them and from what Elliot Turner was telling others.

"In February 2011 Emily told a friend of hers, Carla Simons, that on one occasion after she had been out clubbing with Elliot that he had grabbed her by the throat during the course of an argument.

"In March they went to the Isle of Man and after her death police found a note she had written to him in distinctive pink handwriting on headed paper from the hotel they stayed at.

"It said 'I love you. Do not say you will kill me. Stop talking about your ex girlfriends.

"'Stop being so constantly aggressive. Be more cool because that is so much more hot.

"You make me scared because you are so intimidating. I hate that you are aggressive.

"Stop being so controlling and disrespectful because it will fuck me up.

"I love you."

COURT TOLD OF TURNER'S JEALOUSY

The court was told that Turner became jealous after Emily changed her Facebook profile picture of the pair of them together during a three week holiday to New Zealand in April.

Mr Mousley said: "Elliot Turner left a message on a friend's voicemail.

"It said 'I should've listened to you. She changed the picture of us within two seconds, it's pathetic.

"She changed it to her flirting with some other lads and made me look like a nob."

Mr Mousley said on April 30 the pair had a text message argument after Turner accused Emily of seeing other people.